Romans 13:14. But put on the Lord Jesus Christ, and make no provision for the flesh, to fulfill its lusts.
“Putting on” the armor of God (Ephesians 6:11), while found only in Ephesians, employs imagery found throughout the New Testament: putting on clothing. We do that every morning as we prepare ourselves for the day. We dress ourselves in a manner that will carry us through the day depending on the tasks we have to accomplish. While Paul explains in detail what it means to put on the armor of God, we are also told to put on various things that provide similar spiritual protection. We are told to put on “the armor of light” (Romans 13:12), Christ (Galatians 3:27), the “new man” (Ephesians 4:24; Colossians 3:10), “tender mercies, kindness, humility, meekness, longsuffering” (Colossians 3:12), and love (Colossians 3:14). In essence, to put on the armor of God is to put on Christ Himself and all His attributes. Living each day in obedience and submission to the Lord Jesus Christ will find us totally protected against “the wiles of the devil” (Ephesians 6:11).
Begin each day by clothing yourself in Christ and His truth. In doing so, you will be clothed in the armor of God.
The reason we must put on the whole armor of God is to withstand evil.
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We would never leave our houses without clothes. It is obvious to all that we would be naked. How many times do we leave our homes and are not clothed in faith, truth, salvation, righteousness, readiness, and the sword of the Holy Spirit which is the Word of God? Oh that we were trained early in life to never leave our homes naked of these.